By law, only 25 retired pilots can be recalled through voluntary programs to serve in any one branch of military service, but Trump’s executive order removes that limit, ABC News reported. The order expands the national state of emergency declared in 2001 by President George W. Bush in the wake of the Sept. 11 terrorist attacks as part of an effort “to mitigate the Air Force’s acute shortage of pilots,” said Navy Commander Gary Ross, a Pentagon spokesman.

Secretary of Air Force Heather Wilson said the service was short by 1,555 pilots -- including 1,211 fighter pilots -- at the end of the 2016 fiscal year.

"We anticipate that the Secretary of Defense will delegate the authority to the Secretary of the Air Force to recall up to 1,000 retired pilots for up to three years," Ross said in a statement Friday. "The pilot supply shortage is a national level challenge that could have adverse effects on all aspects of both the government and commercial aviation sectors for years to come."

Don't try this at home: Top home repairs that aren't DIY

— Everyone wants to feel self-sufficient, and even those with deep pockets find it's a good idea to stick to some kind of home maintenance budget. If you chuckled at the thought of having "deep pockets," you're probably even more concerned with controlling costs on the home front.

But frugal isn't always better, even if you have monster DIY skills. "When it comes to doing your own home repairs, there's a thin line between being fearless and foolish," noted Joseph Truini of Popular Mechanics.

Sometimes you have to go all in with the home repair budget, whether it's to avoid bigger, more costly disasters, to assure home safety or to protect your investment. These are six times you should never skimp on home repairs, even if you must hire a pro to get the desired results:

Involved electrical work.

Feel free to install dimmer switches or replace an old ceiling light with a new ceiling fan, Truini advised. "Upgrading existing devices and fixtures is relatively easy and safe, as long as you remember to first turn off the electricity." But anything more complicated than that and it's time to call the pros (and heave a sigh as you get out your wallet). "When it comes to extending existing electrical circuits or adding new ones, call in an experienced, licensed electrician," he said. "When homeowners start messing around with electrical circuits and running new cables, there are two likely outcomes and both are potentially lethal: electrical shock and fire."A leaky roof.

Those drip-drips on the floor, even if it's only the attic floor, can indicate big problems for a homeowner who ignores them. They include possible structural damage, mold or loss of personal property, according to The Balance. "It's nothing to mess with. Address roof leaks as soon as you discover them, and you'll save yourself a ton of cash," it added.

Roof problems can be caused by weather, which can decay roof materials, or a simple lack of maintenance, which most commonly makes a flat or low-sloped roof uneven, so it accumulates water that can destroy roofing material. While a few adjustments can be made by an amateur, the most important roof area to inspect is the flashing, which is supposed to provide a watertight seal between your roof's sections and other parts of the building, according to The Balance. If you try to install, adjust or replace the flashing yourself, you're risking a disaster. "Incorrect installation procedure or attachment, and improper sealing of the flashing will allow the water to enter between the roofing systems and the roof structure."

If the problem is the roof's design, including the slope, drainage or incompatible materials, you should also get an expert roofer involved before the leaks start leaving impressive levels of destruction. While design adjustments are expensive to correct and have to happen while another roofing material is happening, ignoring them will cost many more do-overs and potential roof failures.

Defective water-based plumbing appliances.

Being a homeowner requires a little bit of DIY plumbing for the occasional leaky faucet, clogged drain or stopped-up toilet, according to the Louisville, Kentucky-based Tom Sondergeld Plumbing. "These basic projects can be finished in a couple of hours and don't require any specialized skill," the owner admitted.

But there are larger plumbing issues that can't be ignored, or tackled by a homeowner who's handy with the wrench. One time not to skimp is when a water heater, sump pump or other water-based appliance stops functioning properly. "When these appliances need maintenance or replacement, it can be an extensive process," TSP advised. "A licensed plumber can either repair or replace the appliance properly."

Standing water.

All jokes about hourly rates and attire malfunctions aside, sometimes a plumber's efforts can prevent out and out disasters. One of these instances is when you spot standing water in the house, according to TSP. (Mysterious standing water, that is, not the result of a recent large dog being bathed or a spill you recognize.) The standing water can be close to a water heater, toilet or sink, but the damage may be far more extensive. "A plumber can see if there is more than meets the eye," TSP said. "Typically, standing water is a sign of a much larger problem. Before you start digging into the issue, call a professional and let them use their expertise to diagnose and treat the issue before your home becomes a splash park."

A dirty chimney.

Due to the potential for fires and dangerous fumes, sweeping the chimney annually is not optional, according to the Balance. "Hire a professional chimney sweep once a year to make sure your chimney is free of creosote, bird nests and other flammables," the site recommended.

Clogged gutters.

It may not seem like something worth paying someone to climb up on the roof for, but clogged gutters, downspouts that don't direct away from the house and improper grading can all lead to drainage problems. "All of them put your home's foundation at risk and invite water indoors," noted The Balance. "Now, not later, is the time to tackle those rainwater woes."

Tennis champ Serena Williams looks dejected during her ladies final match against Jelena Ostapenko of Latvia on day three of the Mubadala World Tennis Championship at International Tennis Centre Zayed Sports City on December 30, 2017 in Abu Dhabi, United Arab Emirates. Williams played the match just four months after giving birth on Sept. 1, 2017.(Tom Dulat/Getty Images)

Tom Dulat/Getty Images

— Tennis champion Serena Williams revealed she “almost died after giving birth” to her first child, daughter Olympia, last fall, according to a column by Williams on CNN.com.

Williams had a relatively easy birth Sept. 1, 2017, delivering her daughter by C-section, but two hours later, she was in a fight for her life that lasted six days, she wrote.

“It began with a pulmonary embolism, which is a condition in which one or more arteries in the lungs becomes blocked by a blood clot. Because of my medical history with this problem, I live in fear of this situation. So, when I fell short of breath, I didn't wait a second to alert the nurses,” Williams said.

Serena Williams almost died after giving birth to her daughter. She writes for @CNNopinion about the mothers who don't get the treatment they need for pregnancy complications - and how we can help them https://t.co/0GlM2UFKhU

She underwent three surgeries to deal with the health crisis and credited her medical team for her survival.

“When I finally made it home to my family, I had to spend the first six weeks of motherhood in bed,” she wrote on CNN.com.

“I am so grateful I had access to such an incredible medical team of doctors and nurses at a hospital with state-of-the-art equipment. They knew exactly how to handle this complicated turn of events. If it weren't for their professional care, I wouldn't be here today.”

Williams knew about her health condition and was able to alert medical staffers that something was wrong.

Unfortunately, many women don’t know their health risks. According to the Centers for Disease Prevention and Control, African-American women are three times more likely than others to die from complications in pregnancy or childbirth.

— Famed evangelist the Rev. Billy Graham, who counseled several presidents and preached to millions of people worldwide, died Wednesday, according to the Billy Graham Evangelistic Association. He was 99.

Funeral arrangements have now been finalized and a public viewing is scheduled for early next week.

Billy Graham passed away this morning at his Montreat, North Carolina, home and met his Savior, Jesus Christ. Mr. Graham was 99. For more visit: https://t.co/BqTSDigeaT

The persisting humming has been going on for years and has been described as a similar sound as a truck idling or distant thunder. Some residents even say that the noise has damaged their quality of life and people’s health. Residents have also called the Canadian House of Commons and complained of headaches, irritability, depression and sleeplessness from the noise.

Some residents even claim that the odd sound has been bothering their pets and has rattled windows in their homes.

But, tracing the origin of the noise has been difficult because, apparently, not everyone can hear it. It could also be difficult to get the government to do anything about the hum as regulations typically only cover decibel levels that could lead to hearing damage or loss. Though, Dr. Darius Kohan, a neurotology at Lenox Hill Hospital and Manhattan Eye, Ear and Throat Hospital said that it is unlikely a low-frequency hum could cause damage to one’s hearing.

Sleuths have been looking for answers as to where the hum is actually coming from and have reportedly narrowed it down to furnace operations on Zug Island near the Detroit River. United States Steel, which operates the furnaces, have allegedly been “uncooperative and secretive” when it comes to inquiries about the hum.

Though Mike Provost, a resident of the city refuses to give up and has devoted six years to running a Facebook page that focuses on finding the source of the hum and debunking theories about it.